How can I open an pskx file in blender?
I use the exact same script you linked to and I works fine.
You don't have to get rid of the 'x" in the end as this is only a suffix Gildor, the creator of umodel, introduced because his tool adds some additional values useful to modders. The downside is that a PSKX file cannot be opened inside the UDK. The 'x' simply tells the user that this is psk has been modified.